Rolling Code Operation

The "rolling code" is a one way signal from the EWS 3.3 to the ECM. The "Rolling Code" provides a higher level of sophistication than the ISN of previous EWS systems. Similar to the data exchange between the EWS control module and the transponder chip in each key, the "rolling code" is different every time the engine is started.

The rolling code system requires that each vehicle receive a unique "Rolling Code Table". The rolling code table is assigned and installed by the factory into both the EWS 3.3 and M5.2.1 control modules. The code tables are "burned" into the control modules and can not be overwritten by ZCS encoding software, ECM programming software or the EWS/ECM Alignment Procedure of the Service Function section in the DIS for each system.